Protocol preference - ipv4 vs ipv6

[Paul Goyette <paul%vps1.whooppee.com@localhost>]

what controls the selection of a protocol when both are available?

More specifically, if I 'ftp ftp.netbsd.org' what causes it to try ipv6 first, 
and use ipv4 as a fall back?

My ipv6 connectivity is via a slow vpn (from Manila to San Jose, CA!) so I 
would prefer that connections default to ipv4 unless I explicitly ask for v6.

TIA



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